Facing tool for dressing valve seats



March 17, 1925.

H. M. ALBEE FACING TOOL FOR DRESSING VALVE SEATS Filed July 24. 1924' 2 Sheets-Sheet 1 March 17, 1925. 1,529,858

H. M. ALBEE FACING TOOL FOR DRESSING VI s'LVE SEATS Filed Ju 1y 24, 1924 2 Sheets-Sheet 2 Patented Mar. 17, 1925.

lJhlllEl) STATES PATENT o-FFicE,

HUGH M. ALBEE, OF ORANGE, lVEASSACI-IUSETTS,ASSIGNOR TO THE LEAVITT MA- CHINE. COMPANY, OF ORANGE, IdASSACI-IUSETTS.

FACING- TOOL FOR DRESSING VALVE SEATS. i f

I Application filed July 24, 1924. Serial No. 727,951.

To all whom it may concern:

Be it known that I, HUGH M- ALBEE, a citizen of the United States, residing at Orange, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Facing Tools for Dressing Valve Seats; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to certain useful improvements in facing tools for dressing valve seats, applicable more particularly to gate valves, and has for its object to provide a cutter-bar of the same general type as illustrated in Patent No. 1,227,515, dated May 1912', on the application of @Villiaxns,

Dexter and Smith, with certain ancillary features of adjustment which will insure the centering of the cutter proper wlth respect to the valve seat to be dressed, as will be more particularly pointed out in the following specification, predicated on the accompanying drawings, in which Fig. 1 is a front elevation of the cutterbar.

Fig. 2 is a rear elevation of the same.

F 3 is a partial front elevation showing a modified form of the invention.

Fig. 4 is a side elevation, partly in sec tion, of a gate valve casing with the cutterbar and cutter in operative relation, to effect the dressing of one of the seats.

Fig. 5 is an enlarged front elevation of the lower part of the cutter-bar, with the face plate of the slide removed.

Fig. 6 is a horizontal section on line6-6 of Fig. 5.

Referring to the drawings, Figs. 1, 2, 5 and 6, 1-1 indicate the side members of a flat frame, provided with a connecting yoke 2 at the bottom, which is connected with the side members 1 by scarf joints 3, the upper portion of the frame being bridged by a generally rectangular frame 4 connected to the members l-1 by a suitable joint 5, the several elements being secured together by machine screws. The inner edges of the side members 1-1 are provided with grooves in which operate a two-piece slide, comprising a lower member 3 and an upper member 5, the said members being adjustably connectedtogether by means of a bolt 7 engaging a longitudinal screw-threaded bore 7 in member 3, the head 8 of the bolt fitting in a rectangular recess 6 in the memher 5, so. that when the bolt 7 is turned by a pin engaging radial holes in the head 8 thereof, the two members of the slide will be adjusted toward or from each other. The lower end of the member? is provided with a laterally extending generally arcuate jaw or abutment 4 on one face, which, co-operates with a similarly shaped fixed jaw for abutment 9 on the corresponding face of the lower end 2 of the cutter bar.

Slidably mounted in the cutter'bar frame, below'th'e slide 3, isa second slidelO, which is preferably formed as a generally rectangular hollow casting having a face plate 11, the lateral edges of the slide 10 overlying the inner edges of thebarsl on both sides to'permit the slide to be adjusted longitudinally of the frame. Mounted centrally within the slide 10 is a pivot pin 14, having a rounded forward head to engage a concave recess. in the rear face of a cutting tool A,

generally similar to that s'hown'in the, patent aforesaid, said pivot pin 14E being capable of adjustment longitudinally of its axis and at right angles to the movement of the slide 10. Preferably the pin is supported in its movements in a cylindrical sleeve 13, in tegrally formed with a face plate l2 secured to the main face plate 11 of the slide 10. The

inner end of the pivot pin 14 is screw-threaded and engages the interiorly screw-threaded hub of a worm 18 which is journaled in aligning openings in the front and back plates ofthe slide 10, so that when said worm 18 is rotatedin one direction or the other, the pin 14: will be movedin or out with respect to the slide 10, the pin being prevented from rotating by means of a key 16 which engages slots in the pin and 17 in l the slide. r I

The upper slide, comprising the connected members 3 and5, andthe lower slide 10, are adapted to be adjusted axially of'the of a differential screw spindle mounted for rotatory motion in the frame and held against longitudinal movement in the frame, said screw comprising an upper reduced section 20 projecting beyond the upper end of the frame member 4:, and provided with a, wrench head, and an intermediate screw-' threadedportion 21 of larger diameter, the shoulder porfinn of which abuts the lower frame in which they are mounted, by means 7 5.7 in one side otthe slidernember 5.

' bei'ore described. pinion 19 surfaced, indicated v in Fig. 4L. "cla'inp'lngoperation ise'fi'ecte'd by positionof the threads on the respective spindle "sections 21 and 22 preferably having a ratio or 2 to 1, so that the movement of the upper slide will alway'sbe twice as great as that of "the lower slide.

, Journaled 1n the transect the oritter bafl on the side opposite'the screw spindleato rcsaid, is an'bperating shaft or spindle 30, provided with a wrench head'on its ripper end, with its lower end supported in a recess-in the bottom section 2 ofthe frame,

' the spindle being held against longitudinal movement by aflc'ollar 31 which ablitslthe lower edge ol-Tithe trarne' ,ineniber 4E. The "lower end'o thefspindle80 is flattened tor "a considerable distance on'one side, as at 32, to provide a slidingjiit with the hub 20 or a worm pinion 'l 9,"'niounte' d inthe slide as illustrated in "5 "and 6, which pinion meshes with the worm 18 which is in engagement with thepivot pin let-,jas herein- It will be: noted that the is held against longitudinal moveincnt' wit'hin the slide 1 0,fby the engagement of the ipperandlower'ends' dram hub' sections [20 *with the top and bottom alls otth'e slide to, a d that the l-OWer' end of the spindle, with the flattened face 32 j engaging the correspondinglyshaped openingthron'gh'thehnb of the pinion 19,"ad-' inits of the pinionsliding freely "on'the spindle "32,"as the slide is adjusted" rip and down in the ffrfaine,withoutin any'wayintertering with thepo'siti've' driving co'nn ec-f tifon between-"the spin dle the pinion.

"In, fact thisparticular form or connection between the lower end "of the spindle and the pinionaflords a, simpler and In'oreerl'ec- 'tive drivih'g coupling than would anora dinary' spline 'o'rteather.

, As heretoforeindicated the cutter har, as described, like that of the patent aforesaid,

is designed centering support ijo-r t'he cutting tool A, the cutter-bar beingadapted "tobefpo sitioned" and clamped within the interror or the valverseat or seat'ring, op-

posite -the valve seat or ring to "be regrin;

' ing the critter-bar so. that the lower :or

abutment 9 jen'ga'ges the innersurface of the seat ring, after "wh ch the upper slide 1s adjusted by turnin'gthe "screw s'pindle 2O, to elevate the upper, slide until the jaw or abntinent 4C is forced into firin clamping genient l with the upper Surface. of 'the seat ring. "The operation of the screw of the valve seats.

spindle to elevate the tipper 'slide also elevatels the lowerslide lO, the movement of the latter being only half that of the upper" slide, the object of this ,difierentia'l movement between the slides being to bring the pivot pin-14 in the axial center'oi the valve seat "or seat ring, which would ordinarily position the pivot pin in proper relation to center the rotary'cntting tool or head of the cutter A, with respect to the seat ring to be dressed or resurfaced.

it frequently" happens however thatt'hetwo seatrings or valveseats 01 a valve c'fthis'"characterare not in axial alignment, so that theicentering of thelpivot pin 14 with respect to the seat ring '8 (see Fig. at), would not p'roperly center the head of the cutterA with respect to the seat ring S, which would prevent the latter being properly dressed or resurfaced,

because of the fact that the cutting edges or knives on the rotary head of the cutter A would not engage the whole oi the face The instant invention is designed to obviat e this drliiciilty and provide means for accurately centering the pivot pin 14. with respect to the'seat to be dressed, instead ot centering said pin with respect tothe ring or seat in which the cutter-bar 1S clamped. Th1s=result brought about by adjusting the members 3 and 5 or' theupp'er slide "relatively to each'other,

or in other words adjusting'the member 3' of the upper slide independently of the lower slide 10 which carries" the pivot pin a w The threaded portions 21 and-22 of id. the screw spindle which simultaneously operate the upper and 1 lower slides passes loosely through aflongitndinal bore inthe ineinber 3' of the-upper slide so that the latter may be raised and lowered relatively to the upper member Sci said upper slide by operating the screw 7 in the proper direction, by means. of a pin inse'rted'snc cessivelyih the holes ofthe head e-erthe screw and turning the screwto the right or left. By this ineansthe 'n'ie'rnber "3 of the upper slideinay be so adjusted relatively' to the lower sli de 10 that, when the cutter-bar is firmly clamped in positionin one of the seat rln s asS', the'pivot pin 14 will be in 'exac alignment with the center of the cntter'head onthecntter A. it, for example, the central axis of the ring S, which is the ring to ac dressed,

is lower than that of the ceiitral 'a'rris of the A ring S, which the cutter-bar; is tobe' clamped, the lower member Bofithe upper slide will be raised by, an aino' in't equal to one-half the lineal"distancebetween the central axes of the rings S and S so that when the jaws i a'nd'9 of the cuttei bar are forced into clamping engagement with'the ring S, by operating the screw spindle 20,

[the lower slide 10 willlbe elevated and the pivot pin 14: will be inexactaxialalignfrom each other as the case may be.

ment with the geometrical center of the ring S. On the other hand, if the center of the ring S is higher than that of the ring S, the lower member 8 of the upper slide will be moved downwardly by the screw 7 a distance equal to one-half the distance between the centers, after which the operation of the screw spindle to clamp the cutter bar into position, will move the lower slide just sufficiently to bring the pivot pin 14: into axial alignment with the center of the cutter head. It will therefore be seen that the device is adapted to position the pivot pin 14 exactly in axial alignment with the center of the head of the cutter disc on the cutter A, when said cutter head is in proper relation to the face of the valve seat to be dressed, irrespective of the relative positions of the longitudinal axes or geometr3 cal centers of the respective valve seats.

In Fig. 8 a modification of the means for relatively adjusting the two members of the upper slide is shown, this particular form of adjustment being desirable in relatively large cutter-bars to effect a rapid adjust- It will be noted that the adjusting screw 7 connecting the upper member 5 with the lower member 8, double screw, the threads on the respective ends being opposite in direction and engaging screwthreaded sockets (3 in the upper member 5? and 3 in the lower member 3 so that when the screw is turned by a pin engaging the radial holes in the head 8, the slide members 3 and 5 will be rapidly adjusted toward or This specific form of adjustment between the slides is an obvious variant of that shown in the preceding figures and, as indicated, is employed in tools of this character of relatively large size in order to facilitate the adjustment of the two members of the upper.

slide.

What I claim is:

1. A cutter-bar for gate-valve seat dressing tools having a plurality of relatively movable holding elements for engaging a valve-casing and holding the cutter-bar to said casing, a pivot element movable longitudinally of the bar, means carried by the cutter-bar to simultaneously effect relative movement between said holding elements and relative movement of a predetermined ratio between the pivot element and one of said holding elements, and means for adjusting the last mentioned holding element independently of the pivot element.

2. A. cutter-bar for gate-valve seat dressing tools having a plurality of relatively movable holding elements for engaging a valve-casing and holding the cutter-bar to said casing, a pivot element movable longitudinally of the bar, means carried'by the cutter-bar to simultaneously effect relative movement between said holding elements and relative movement at a two-to-one ratio between the pivot element and one of said holding elements, and means for adjusting the last mentioned holding element independently of the pivot element.

3. A cutter bar for gate-valve seat dressingtools having at different points in the length thereof a pair of relatively movable holding elements for engaging the interior justing the movable holding element independently of the pivot element.

a; A cutter-bar for gate-valve seat dress ing tools having a plurality of relatively movable holding elements for engaging the interior of a valve-casing and holding the cutter-bar to said'casing, a pivot element carried by said cutter-bar for co-operation with a cutter, means for imparting differential feed movements to one of said holding elements and said pivot elements crosswise of the axis of the pivot element, and means for adjusting the last mentioned holding element independently of the pivot element.

5. A cutter-bar for gate-valve seat dressing tools having at different points in the length thereof a pair of relatively movable holding elements for engaging the interior of a valve-casing and holding the cutter-bar to said casing, one of which elements is fixed and the other of which is carried by a slide movable lengthwise of said cutter-bar, a second slide movable lengthwise of said cutter-bar, a pivot element carried by said sec-.

ond slide for co-operation with acutter, means for imparting differential feed movements to said slides, and means for adjusting the movable holding element independently of the pivot carryingslide.

6. A cutter-bar for gate-valve seat dressing tools having at different points in the length thereof a pair of relatively movable holding elements for engaging the interior of a valve-casing and holding the cutter-bar to said casing, one of which elements is fixed and the other of which is carried by a slide movable lengthwise of said cutter-bar, a second slide disposed between said holding ele- 'ments and also movable lengthwise of said cutter-bar, a pivot element carried by said second slide for co-operation with a cutter, means for imparting differential feed move ments to said slides, and means for adjusting the movable holding element independently of the pivot carrying slide.

7. A cutter-bar for gate-valve seat dressing tools having a. plurality of holding elements for engaging the interior of a valvecasing and holding the cnttenbar to said casing, one of said holding elements being movable on said cutter-bar, a pivot element carried by said cutter-bar and having its axis crosswise thereof for co-operation With a cutter, means for shifting said mevahle holding element and the pivot element relatively to each other transversely of the axis of said pivot element, and means for adjusting the movable holding element independently of the pivot element.

8'. A cutter-bar for gate-valve seat dressing' tools having a plurality of holding elements for engaging the interior of a valvecasing and holding the cutter-bar to said casing, one of said holding elements being niovahle on said cutter-liar, a pivot element carried by said cutter-liar and hav ng its axis crosswise thereof for co-operation with a cutter, means for shifting said movableing tools having a slide thereon including an element for holding'said cutter-bar to a Valve-casing, a centering slide movable lengthwise of said cutter-bar, means carried by the v cutter-bar for simultaneously im- -slide coniprisii vartino' to said slides *nofoortional move- Q l ,L y

.rnents, and means for adjustingvthe holding neonsly efiecting differential movements of said slides, and means tor adjusting the jaw carrying slide independently of the pivot carrying slide. V i

11, A; cut dear for gatevalve seat dy ing tools ha l g a fixed holding jaw, 21

jnstable longitudinally oi the bar, a slide intermediate said jaws carryi; I tering pivot and means for sin'mltaneonsly effecting differential movements {of said slides. Y Y

12. A cutter-bar forgate-valve seat dressing toolsfhaving a fixed holding j avr, a slide carrying a complementary holding jaw, said slide comprising an u per section, a lower section and a screw connecting said sections to adjust the latter tovvard and from each other, a slide intermediate said jaws carrying a tool centering pivot; and means for simultaneously effecting movements of said slides. I I

In testimony whereof I aiiix my signature.

HUGH ALBEE.

. ole. carrying a c np l ementary holding aw, said two sect ons relatively addifferential 

